Electric-arc lamp.



T. J. RENSINGE ELECTRIC ARG LAMP.

APPLICATION FILED AUG. 14, 1908.

Patented. Feb. 1, WW.

WWW

UNlTED STATES PATENT OFFICE.

THEODOR JOSEPH RENSING, OF

LEIPZIG, GERMANY, ASSIGNOR T KfiRTING &

MATHIESEN AKTIENGESELLSCHAFT, 0F LEUTZSOH, NEAR LEIPZIG, GERMANY.

ELE CTRIG-ARC LAMP.

Specification of Letters Patent.

Application filed August 14, 1908.

Patented Feb. 1. 1910.

Serial No. 448,558.

To all whom it may concern:

Be it known that I, Tnnooou Josnrn RENSING, a subject of thoGerman Emperor, residing at Leipzig, Germany, have invented new and useful Improvements lelating to Electric-Arc Lamps, of which the following is a specification.

This invention relates to are lamps which 1 are provided with an economizer and the invention is particularly applicable to lamps in which one or both electrodes is or are mineralized.

' In arclamps of this type it has been found downward toward the bottom of the globe that the vapors emitted at the are are liable to deposit upon the inside of the globe. This is due to the action of the ecouomizer, tor the vapors beneath it in place of passing directly upward move laterally against the comparatively cold globe and then move 1 downward, eddies being formed when the cooled vapors are met by the current of cold air which risesupward in the center of the globe toward the are. A depositon the globe takes place especially when the arc is first struck and the globe is cold.

According to my invention I combine in r an electric arc lamp with an economizer an outer globe provided with a passage situated at the lower portion thereof for the inlet of cept for the air inlet and the opening formed air from the outside of the lamp, an inner globe open top and bottom whose upper portion is at about the level of the arcfornnng portion of the electrodes and which (2 will be met by a current of air traveling upward at some velocity, since the inner globe is veryquickly heated by the arc and is protected against cooling by the. body of air separating the two globes.

What I claim is z- 1. In an electric arc lamp, the combination with an economizer, of an outer globe provided with a passage situated at the lower portion of the globe and leading to the outside of the lamp for the inlet of air, an inner globe open top and bottom com municating with the outside of the lamp for the discharge of air therefrom and extending below the arcforming portion of the electrodes, the outer globe being closed exby the inner globe.

2. In an electric arc lamp, the combination with an economizer, of an outer globe communicates with the outside of the lamp, the outer globe being closed except for the air inlet and the opening tormed by the inner globe. It will be seen that with this construction there will be not only enough current of air through the inner globe, thus preventing vapors from the are entering the outer globe. but there will be an undisturbed body of air between the inner and outer; globe wlnch prevents the cooling of the mner globe and also prevents any deposit torn'iing on the walls of the inner globe.

in the accompanying drawings Figure 1 shows the invention applied to a lamp pro- 3 vided with a pair of converging electrodes and Fig. 2 to a lamp provided with an upper and lower electrode. I

in the drawings (L is an ash plate through which air can pass, I) is the outer globe, c the inner globe, (Z is the economizer, c is the plate which carries the inner globe and closes the top of the outer globe, f is a cylinclosed at the top and provided with a passage situated at the lower portion of the globetor the inlet of air from the outside of the lamp, an inner g obe open top and bottom whose upper portion is at about the level of the arc-forming portion of the electrodes and which connnunicates with the outside of the lamp, the outer globe being closed except for the air inlet and the opening formed by the inner globe.

2-3. In an electric arc lamp, the combina tion with an economizer, of an outer globe closed at the top and provided atthe bottom with a passage for the inlet of air from the outside of the lamp, an inner globe open top and bottom whose upper portion is at about; the level of the aroforming portion of the electrodes and which con'nnunieates with the outside of the lamp through its upper end, the inner and outer globes thus forming between them at the upper portion of the outer globe a chamber open at the lOO bottom but otherwise closed containing an i posits from falling through said inner globe undisturbed body of air that prevents the and coming in contact with the Walls of the cooling of the inner globe and so prevents outer globe.

any do csit forming on the Walls of the THEODOR JOSIIP II RENSING. inner giobc While the air entering the bot- Witnesses:

tom of the outer globe passes directly RUDOLPH Fmonn,

through the inner globe and prevents de- 1 PAUL HEYCK. 

